JWT Decoder
Decode and inspect JSON Web Token headers and payloads.
How to Use
- 1
Paste your JWT token
Copy the full JWT string (starting with eyJ...) and paste it into the input field.
- 2
View decoded sections
The tool splits and decodes the header, payload, and signature sections automatically.
- 3
Check claims and expiry
Review the payload for claims like exp (expiration), iat (issued at), and any custom claims.
Frequently Asked Questions
Paste the full JWT string into the input field and the tool will instantly display the decoded header and payload sections, including claims like expiration time and issuer.
Yes, this tool runs entirely in your browser. Your token is never sent to any server, so your credentials and claims remain private.
A JWT contains three parts: a header (algorithm and token type), a payload (claims like user ID, roles, and expiration), and a signature used to verify authenticity.